A convenient one-pot preparation of 4-substituted or 3,4-disubstituted quinolin-2(1H)-ones from 2-isocyanostyrene derivatives, which involves mCPBA oxidation to the corresponding isocyanate intermediates followed by electrocyclization, is described.
Photoredox radical cyclization reaction of <i>o</i>-vinylaryl isocyanides with acyl chlorides to access 2,4-disubstituted quinolines
作者:Peng-Fei Huang、Jia-Le Fu、Jia-Jing Huang、Bi-Quan Xiong、Ke-Wen Tang、Yu Liu
DOI:10.1039/d3ob01915b
日期:——
We herein report an efficient photoredox radical cyclizationreaction of o-vinylaryl isocyanides with acyl chlorides to access a wide range of 2,4-disubstituted quinolines. Preliminary mechanism experiment results suggested that this reaction was initiated by an acyl radical generated from acyl chlorides through a single-electron-transfer (SET) process. This transformation showed good substrate suitability
A visible-light-induced radical cyclization reaction of o-vinylaryl isocyanides and oxime esters to access various 2,4-disubstituted quinolines was disclosed. Oxime esters were employed as acyl radical precursors via the carbon–carbon bond cleavage. It provided an effective way for the synthesis of 2-acyl-4-arlysubstituted quinolines under mild conditions and exhibited good functional group tolerance
The heating of o-isocyanostyrenes (1) in diglyme at reflux temperature for 2 h afforded the corresponding 2,2'-biquinolines (2) via a coupling/electrocyclic reaction in fair-to-good yields.